Comparison of our MSTO+SGB age estimates with OC ages from Cantat-Gaudin et al. (2020). In each panel, grey dots are individual OC member MSTO stars (membership probability > 95%), colour-coded by their posterior age uncertainty. For OCs that contain more than three MSTO cluster members, the uniform coloured points and error bars indicate the median age and the 1σ quantiles. The star symbol indicates the SGB-only sample, which has lower StarHorse uncertainties. The horizontal error bars reflect the 0.2 dex uncertainties quoted by Cantat-Gaudin et al. (2020). The only OC that was observed by all surveys is M 67 (NGC 2682). We do not show comparisons for RAVE and SDSS since there were fewer than five stars in common with the cluster sample. The dashed black line delineates the identity line, while the grey dashed lines correspond to a ±30% deviation.